jbpm-installer-7.61.0.Final can not login by default username/password like admin/admin

follow the offical document https://docs.jbpm.org/7.61.0.Final/jbpm-docs/html_single/#_jbpminstaller   I run 2 commads on my win10 pc

1,ant install.demo.noeclipse
2,ant start.demo.noeclipse 

all things works very well,and then I follow the chapter  6.4.10  ,  the URL http://localhost:8080/business-central  response a 404 page,I fixed this myself, I think it was http://localhost:8080/jbpm-console . But  I can't  login use krisv/krisv  or  admin/admin as user name / password.

can someone tell me  how to fix this?